Rung-defected ladder of azido-bridged Cu(ii) chains linked by [Cu(picolinate)2] units

Abstract

A novel two-dimensional (2D) azido-based Cu^II network, [Cu₁₁(pic)₆(N₃)₁₆] (1), was prepared using picolinic acid (Hpic) as coligand. Interestingly, 1 is composed of symmetric double azido EO-bridged [Cu(N₃)₂]_n chains linked by [Cu(pic)₂] units making a regular ladder with a missing rung. These rung-defected ladders are assembled in a layered structure by long azido-Cu^II contacts between neighboring [Cu(N₃)₂]_n chains. The magnetic properties of 1 are dominated by significantly strong antiferromagnetic coupling (J/k_B = −15.4(2) K) between Cu^II spins through the double EO azido-bridges along the [Cu(N₃)₂]_n chains.